Nova Patents
US6858768B2

Oxidative dehydrogenation of alkanes to olefins using an oxide surface

Summary by NHIP

Oxide-catalyzed alkane dehydrogenation

The method produces olefins by contacting an alkane and oxidant with a metal-free oxide catalyst at 300 to 700° C. Distinctive features include maintaining contact time under 200 milliseconds and achieving ethylene yields of at least 25% or 50% using primarily zirconia or mixed oxides.

Claim Score by NHIP

Read claim 1, the broadest

Abstract

A catalyst useful for the production of olefins from alkanes via oxidative dehydrogenation (ODH) is disclosed. The catalyst includes an oxide selected from the group containing alumina, zirconia, titania, yttria, silica, niobia, and vanadia. The catalyst does not contain any unoxidized metals; it is activated by higher preheat temperatures. As a result, similar conversions are achieved at a considerably lower cost.

Term

Term ended

Expired 21 September 2022, 4 years ago.

  1. Priority
  2. Filed
  3. Granted
  4. Expired
  5. Today

6 claims: 1 independent, 5 dependent

  1. 1
    Broadest claimClaim Score 62, broad(NHIP)A method for the production of olefins by oxidative dehydrogenation wherein the method comprises the steps of:(a) forming a feed stream comprising an alkane and an oxidant;(b) heating the feed steam to a temperature of approximately 300-700° C.;(c) contacting the feed stream with a catalyst consisting essentially of one or more oxides selected from the group containing alumina, zirconia, titania, yttria, silica, niobia, and vanadia;(d) maintaining a contact time of the feed stream with said catalyst for less than 200 milliseconds under oxidative dehydrogenation favorable conditions so as to produce olefins;and (e) recovering olefins.